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Meta Search engine :)

 
Greenhorn
Posts: 6
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Hello everyone
I am trying to build an meta search engine in java with struts framework .!!!
Getting an null pointer exception did every possible mean to remove it ... Working on netbeans ide

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: java.lang.NullPointerException
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:535)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:433)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

root cause

java.lang.NullPointerException
org.meta.search.IR.Bo.TestingHtmlParser.searchEngines(TestingHtmlParser.java:204)
org.meta.search.IR.Bo.TestingHtmlParser.getSearchResultsFromSearchEngines(TestingHtmlParser.java:175)
org.meta.search.IR.Bo.TestingHtmlParser.getParsedContents(TestingHtmlParser.java:118)
org.meta.search.IR.Bo.TestingHtmlParser.getSearchResults(TestingHtmlParser.java:87)
org.meta.search.IR.Bo.AggregationWrapper.getIndividualSearchResult(AggregationWrapper.java:168)
org.meta.search.IR.Bo.AggregationWrapper.getSingleAggregatedResult(AggregationWrapper.java:83)
org.meta.search.IR.Bo.AggregationWrapper.getAggregationResult(AggregationWrapper.java:64)
org.meta.search.IR.Bo.SearchSeparateEngines.searchProcess(SearchSeparateEngines.java:68)
org.meta.search.IR.Action.SearchAction.getNormalSearch(SearchAction.java:133)
org.meta.search.IR.Action.SearchAction.execute(SearchAction.java:41)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

Any idea what possibly could have gone wrong !!!
Regards
Indiz
 
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Posts: 11497
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Please do not post essentially the same question across fora.
Let us continue the discussion in your original post here https://coderanch.com/t/609203/java/java/Meta-search-engine
Did you check out Jesper's suggestions there?
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